currenttransform

The currenttransform filter has value a string representing the current transforms acting on the filter, in right-to-left order. It takes no arguments and always matches. It is usually used with message or comment for debugging.

For example,

    message currenttransform 

outputs just the string <>.

But

      X=a1
      flipvertical{
        X== h1
        message currenttransform

will output the message: <reflect_v> . A more complex example:

  shift ⬓✵{
  ♖a1 ♜a7
  comment(notransform a1 "-->" a1
          "; "
          notransform a7 "-->" a7
	  " via: " currenttransform)}